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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e04966828ce20cc9fdf1dcc426c6672de6afe7f042b161b709440a125ab2d4' 
  AND token = 'tvajJ/HfzmGnvDgCzo2d5bnaf6Lj8yiWop55lwjHeUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}